The largest diamond discovered in the past 100 years is going up for auction Wednesday evening (June 29) in London, U.K., and it’s expected to fetch upwards of $90 million. About the size of a baseball, the gemstone measures in at a whopping 1,109 carats.

The Lesedi la Rona diamond, as it is now called, was found last November in a Botswana mine owned by Vancouver-based Lucara Diamond Corp. As for how they found it, the company credits state-of-the-art technology installed in the mine back in 2015.

“I think it’s important to understand this stone was not recovered by what most people imagine based on movies they’ve seen, which is somebody standing in muddy water,” Lucara Diamond CEO William Lamb said. “It was actually discovered by some of the latest technology to be employed by the diamond mining industry.”

It’s no wonder why the diamond is being called “the find of a lifetime”. You can see it for yourself in the video above.